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    Proc Natl Acad Sci U S A. 1977 Nov;74(11):5088-90.

    Phylogenetic structure of the prokaryotic domain: the primary kingdoms.

    Abstract

    A phylogenetic analysis based upon ribosomal RNA sequence characterization reveals that living systems represent one of three aboriginal lines of descent: (i) the eubacteria, comprising all typical bacteria; (ii) the archaebacteria, containing methanogenic bacteria; and (iii) the urkaryotes, now represented in the cytoplasmic component of eukaryotic cells.

    PMID:
    270744
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC432104
    Free PMC Article

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